Zynga shares were off 13.5% at last check.
Trading in Facebook shares was heavy on their first day with more than 300 million shares traded Friday afternoon.
Facebook won’t immediately enter the social media fund or IPO ETFs due to index inclusion rules. [Facebook: Which ETFs Will Like it?]
On Friday, traders used social media stocks such as Zynga to hedge or bet against Facebook, Reuters reported.
Global X Social Media ETF
